Automatic cut-off for gas-burners.



L. www/ABUS. AUTOMATIC CUT-OFF FOR GAS BURNERS.

APPLICATION FILED FEB.12.19|7.

l, flg Pateutd Jan. 22, 1918.,

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AUTOMATIC CUT-OFF FOR GAS BURNERS.

APPLICATION FILED FEB. I2. 1917.

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IHUQIIIOL o o m L. W. EDWARDS. AUTOMATIC cumff FOR GAS BURNEHS.

APPLICATION FiLED EEB. l2, 1917.

Patented Jan. 22, i918.

3 SHEETS-SHEET 3.

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W'HAM EJSDW'ARES, 0F @GEEST CTY, PENNSYLVANA.

naasten.

To all @atom t may concery i Be it lrnovvn that l, Leon Wmnrarr Entvanns, a citizen ot the lUnited States, resid ing at Forest Citya in the county ot Susque hanna and State ot ltlennsylvania9 have invented certain nevv and uset'ul lmprovexnents in Automatic Cut-@tts tor Gras-Burners; and ll do declare the following to be a lull, clear, and exact description et the invention, such as Will enable others skilled in the art` to which it appertains to malte and use the same.

This invention relates to improvements in attachments tor gas burners and similar nl i tures.

The principal object ol the invention is to provide means tor automatically shutting ed' the tlovv of gas in case the light is casually blown out or iti the llovv .ot gas through the pipes momentarily ceases. f

nu additional object is to provide a device et this character having a main and supplemental cut-oit' valve9 the latter being normally operated by a tlfiermostat9 but which is held in an open position by the opening of the main cated valve until the thermostat becomes heated.

With these and many other objects in vievv the invention resides in the novel teatures et oonstructiom combination and ar rangement et parte which will be hereinatter particularly described and elainfied.7

ln the accompanying drawings Figure l. is a side elevation partly in sec-- tion et a gas burner constructed in accord ance with my invention;

Figa 2 is a detail side elevation of certain et the parts shovvn in Fig., 1;

llig. Sl is a trout elevation partly in section et the gas burner;

ltig. t is a horizontal section on the plane ot the line tw-Lt ot Fig. 1;

Fig. 5 is a vievv similar to Fig. d showing theparts in a slightly dillerent position;

lllig. ti is a. detail perspective vievv ot the thermostat shown in ligs. It and 3;

Fig. l is a side elevation partly in section ot a modified term ot burner constructed in accordance vvith the invention;

Figc 8 is a horizontal section on the plane ot the line 8-8 ot llig. 'l g and 9 is a detail vertical section on the line tl-tl ot Fig?. l.,

.ds shown by the illustrations in the accompanying drawings my invention may be Serial. No. 148,153..

embodied in several. ditlerent forms, all ot which, however, operate in substantially the same manner. llt is also obvious that each ot the burners is provided with a main and a supplemental cut oft valve or stop coclr7 a thermostat tor operating the lottery and means operable by the opening ont the main stop cock to hold the supplemental valve in an open position until it can be retained in such position by the expansion ot the ther-A mostat.

@ne form ott the invention is illustrated in vFigs. 1 to 6, this device consisting of a tin ture 1 of suitable construction having a horizontal supply pipe 2, one end ot which is secured to a source of supply, While the other end is extended upwardly and has a burner 3 lixed thereon. rllhis burner is constructed to receive a gas mantle d ot any ordinary or preferred design. A stop coclr ti controls the main dow ot' gasthrough the supply pipe 29 While a supplemental cut-od valve tl is positioned in the upright portion 2 imunedi ately below the bottom of the burner 2l.

1lhe stop cock 5 is of usual design.D it consisting ot a casing and a rotatable plug l', the latter having a key or other form et linger piece 8. The supplemental cut-oit" valve consists of a casing 9 havinga passageway 10 therethrough, a valve seat being provided in said passageway for the reception et a. valve 6. The outer end of this valve forms a stein and projects through a stulling box in the wall of the casing. This outer end ot the valve stem is also inclosed in a casing 12 in which is disposed a spring 13 tor normally holding l the valve closed. An adjusting nut lt regulates the tension of the spring 13 to vary the resistance against which it is necessary to A Patented @lam i titl Bti

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open the valve, thus regulating the llovv of gas therethrough..

Carried by the burner 3 is an upright post or standard 15, the upper end ot said post terminating about midway the mantle t and having one end ot an annular thermostat 16 tired thereto, said thermostat surrounding the mantle as shown. Theothcr end of the thermostat has a link 17 pivoted thereto, said link connecting said thermostat With a crank 18 formed on the upper end ot a vertical rock; shaft 19. 'lhis shaft 19 is rotatably mounted in suitable bearings carried by the post 15 and extends through the burner to a point adjacent the supplemental cut-odJ valve 6.

The lower end ot the rock shalt carries an arm 20 which is positioned between the 1 lll@ y mantle 4, the shaft will Y 'y valve open.

' 'the thermostat cools,

rocked in a direction to ing 9 and a depending lever 21 which is pivoted within the housing 12 and extends through an opening in the lower side thereof, the intermediate portion of said lever bein pivoted to the stem of the valve 6.- lt will be seen that although the spring 13 normally retains the valve within its seat, yet by movement of the lever 21 in the pi'opcr direction, said valve may be opened to allow gas to flow through the passageway 10. The purpose of the arm 20 is to force ihe lever 2l away from the casing to open said' valve. The thermostat 16' is so constructed and the rock shaft 19 and its arm 20 are so connected thereto that when said thermostat is expanded by the heat of the be rocked to cause the arm 2O to engage the lever 21 to hold the As soon as the flame within the put out through any cause and the shaft 19 will be disengage the arm 20 from the lever 21 to permit the spring 13 to close said valve.

In those burners constructed somewhat similar to the present invention, it is necessary to manually hold the supplemental cutoft valve open until the thermostat is heated sufiiciently for it to-perform its function, namely, holding the supplemental valve open. In my invention, however, as hereinbefore mentioned, this is accomplished automatically by the opening of the main valve or stop cock 5. One means of carrying out this automatic opening of the supplemental valve is shown in the above mentioned ligures and consists of an arm 22 secured to the plug 7 of the stop cock 5 and having a cam-shaped end as at 23, and a sliding rod 24. rl`his rod is suitabl disposed to slide on the supply pipe 2 and has one end bent laterally as shown at 25, while the other end is constructed in the form of a loop 26 and sur rounds the ortion 2 of the supply pipe. The upwardly bent end 25 is adapted to be engaged by the cam face 23 of the arm 22, while the end of the loop 26 enga es the lever 2l. A spring 27 normally holds the sliding rod 24 out of engagement with the lever 21. With this construction, it will be seen that as soon as the plu 7 is partially rotated to open the stop coc, the cam face 23 will engage the portion 25 of the rod and cause it to be moved in a direction to open the supplemental valve 6. When the thermostat has become thoroughly heated, the sto cock may be opened to its fullest extent, an when in this position, the cam face will not engage the end of said rod 24 so that 1f the flame is casually extinguished, the supplemental valve may readily close.

An additional means for automatically operating the supplemental cut-off valve when the flame is accidentally extinguished is shown in Figs. 7 to 9. 1n this case, a

mantle 4 is burner 30 having an ordinary tip is illustrated, the gas to said burner being fed through a supply pipe 31 as in the previous form, said gas being controlled by a stop cock 32 and a supplemental cut-oli' valve 33. In this form, the supplemental cut-oli` valve is constructed in substantially the same manner as that previously described and illustratcd in the first mentioned set of figures. The thermostat 34, however, is somewhat different, it being substantially vertical and composed of one or more strips of metals having different coefficients of expansion.'

A bracket 35 extends from theside ofthe burner over the spring housin 33 of the supplemental valve and has a ever 36 pivoted thereto intermediate its.ends'asA shown at 37. This lever is used to support the thermostat and also to open the supplemental valve. The upper end of the lever carries a laterally extending arm 38 to which the upper end of the thermostat 34 is secured, the lower end of the latter terminating adjacent to the horizontal portion of the bracket 35. The lower end of the lever has a laterally extending arm 39 for engagement with the lever 40 which is connected with the valve stem of the supplemental valve and corresponds to the lever 2l of' the first described form.

The thermostat 34 is so constructed that when it is heated by the flame from the tip of the' burner, it will bend toward said burner and thus cause the lever 36 to rock on its pivot 37, thereb moving the lower end of said lever in a irectioii to open the supplemental valve. As soon as the flame is extinguished, however, the thermostat cools and assumes its vertical or straight position and causes the lever to rock in such a direction as to close the valve and cut off the flow of gas.

The means for holding the supplemental cut-off valve open until the thermostat becomes thoroughly heated may be constructed as shown in Figs. 1 to 6 or as shown in Figs. 7 to 9. That shown in the last mentioned series of figures is used when the supply pipe of the burner is short, or when it is otherwise desirable to have the stop cock 32 disposed adjacent the upright part of the supply pipe or beneath the housing 33. In such a case the upper end of the plug 32 of the stop cock 32 is rovided with a laterally extending arm liaving an upwardly bent portion 41, said end being adapted to ei'igage thc end of the lever 40 when the plug is rotated to partially o en said stop cock. When this engagement lietween the end of the lever 40 and the end 41 of the arm takes place, the valve of the supplemental cut-olf valve will be forced open against the tension of its spring, but as soon as the thermostat becomes heated and the stop cock 32 is opened to its fullest extent, the two parte will be Manatee v all disengaged so that the supplemental valve will be free to close as soon as the thermostat cools.

'Ihus it will be seen that this arm with its upwardly bent end 41 serves the same purpose as the rod 24 of the irst described form. It will also be obvious that it may be used with the annular thermostat as well as the straight thermostat shown in Fig. 7.

Having thus described my invention, what I claim is l. In a device of the class described, the combination with a supply pipe, a burner on the end thereof, a cut-oli' valve in said pipe, a contractile spring for normally retaining said valve closed, an upright post carried by the burner, an annular thermostat surrounding said burner and having one end attached to the end of the post, a link pivoted to the other end of the thermostat, an upright rock shaft having a crank on its upper end connected with said link, and an arm on the lower end of the shaft for engagement with said cut-off valve to hold the same open against the tension of said spring when the thermostat is heated.

v2. In a device of the class described, the combination with a supply pipe, a burner on the end thereof, a cut-olf valve in said pipe, a spring for normally retaining said valve closed, an upright post carried by the burner, a thermostat adjacent said burner and having one end attached to the post, a link pivoted to the other end ofthe thermostat, an upright shaft having its upper end connected with said link, and an arm on the lower end of the shaft for engagement with said cut-off valve to hold the same open against the tension of said spring when the thermostat is heated.

3. In a device of the class described, the

combination with a supply pipe, a plug cock l valve, a spring for holding said rod in an operative position, and a cam carried on the upper end of the stem of said cock, said cam engaging the lother end of said rod to hold said supplemental valve open against the tension of said spring until the thermostat becomes heated and said cam being operated by the rotation of said plug to open said cock.

In testimony whereofI have hereunto set my hand in the presence of two subscribing witnesses. n

LEUN .WILLIAM EDW 1 `i Witnesses:

I?. M. GARDINER, A. IF. SURNGLE. 

